US PATENT SUBCLASS 137 / 91
.~.~ By specific gravity

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
88  DF  .~ Mixture condition maintaining or sensing {4}
91.~.~ By specific gravity

DEFINITION

Classification: 137/91

(under subclass 88) Systems in which the condition maintained or sensed is specific gravity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

403+, for systems in which a single flow is controlled by weight of an accumulated fluid, and see the search notes to subclass 403.